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bpf: Add missed value to kprobe_multi link info

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Add missed value to kprobe_multi link info to hold the stats of missed
kprobe_multi probe.

The missed counter gets incremented when fprobe fails the recursion
check or there's no rethook available for return probe. In either
case the attached bpf program is not executed.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Song Liu <song@kernel.org>
Reviewed-by: Song Liu <song@kernel.org>
Acked-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/bpf/20230920213145.1941596-3-jolsa@kernel.org
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Jiri Olsa authored and Andrii Nakryiko committed 2023-10-02 11:17:48 -07:00
1 parent b520bcd7d8
commit de02cb1697
1 file changed
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include/uapi/linux/bpf.h
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@@ -6532,6 +6532,7 @@ struct bpf_link_info {
__aligned_u64 addrs;
__u32 count; /* in/out: kprobe_multi function count */
__u32 flags;
__u64 missed;
} kprobe_multi;
struct {
__u32 type; /* enum bpf_perf_event_type */